Scrutiny of demand curves DD and D0D0 reveals such that: (1) D0D0 is relatively more elastic at a price of P1. (2) DD is relatively more elastic at a price of P2. (3) D0D0 probably reflects the demand for a biological necessity. (4) DD most likely represents the demand for a good along with more close substitutes. (5) price elasticity is constant along DD but not along D0D0.
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